Stereochemistry of the catalysed Diels–Alder reaction between cyclopentadiene and dimethyl monothionofumarate; soft versus hard Lewis acids
作者:D. Christopher Braddock、John M. Brown、Patrick J. Guiry
DOI:10.1039/c39930001244
日期:——
In the title reaction, hard Lewis acids promote the formation of the endo-ester diastereoisomer with up to 96% selectivity whereas soft Lewis acids give the endo-thionoester with up to 89% selectivity. BF3·OEt2 behaves as if it were in the latter category, giving 94%endo-thionoester.